| Acronym | Definition |
|---|
| CESI | Centro Elettrotecnico Sperimentale Italiano (Italy) |
| CESI | Chauffe-Eau Solaire Individuel |
| CESI | Canadian Educational Standards Institute |
| CESI | Centre d'Etudes Superieures Industrielles (French) |
| CESI | Confédération Européenne des Syndicats Indépendants (French: European Confederation of Independent Trade Unions |
| CESI | Critical Ecosystem Studies Initiative |
| CESI | Catalytica Energy Systems Inc |
| CESI | Computer Education Society of Ireland |
| CESI | Community Empowerment and Social Inclusion |
| CESI | Center for Education and Counselling of Women |
| CESI | Centro di Scienze dell'Invecchiamento (Italian) |
| CESI | Cardiac Electrophysiological Simulation |
| CESI | Clinical Evaluation and Services Initiative |
| CESI | Cervical Epidural Steroid Injection |
| CESI | Council of Elementary Science International |
| CESI | Chinese Electronic Standardization Institute |
| CESI | Committee on Environmental and Social Impacts |
| CESI | Computerized Enrollment System for Instructors |
| CESI | Center for Economic and Social Information (UN) |
| CESI | Capitol Environmental Services Inc. |
| CESI | Communications-Electronics Standing Instruction |
| CESI | Center for Economic and Social Inclusion |
| CESI | Computer Educational Support Initiative (Lagos, Nigeria) |
| CESI | Certification Exhaust System Inspector |
| CESI | Continuing Education Services Inc. |
| CESI | Communications and Electrical Supplies Inc. |
| CESI | Centre d'Exploitation des Services Internet (French) |
| CESI | Capitol Exhibit Services, Inc. (Manassas, VA) |